METER NOT OPERATING AFTER BASIC CHECKS
Test photocell assembly.
Lay the spectrophotometer on
its left side and disconnect the photocell assembly
cable (1) from amplifier circuit board (2) connection
Set a VOM to the 50 microampere range and connect
the positive lead to the photocell cable shield and the
negative lead to the center conductor.
Set the spectro-
photometer wavelength dial to 700 nm and turn the
Rotate the light control fully clockwise.
The VOM should indicate from 5 to 15 microamperes. If
not replace photocell.
Place instrument in operation.
Zero adjust control
should cause movement of needle.
If not and assuming
previous correction actions have been completed, proceed